You remember those rings that are everywhere in slime rancher, those massive ones?Well There is one in the ruins too, at the start...I expected those to originate from the ruins, but they do not,In the picture the ring looks out of place, it is to dark to fit in with the light stone of the ruinsWhat do you think?

Could just be the shading. Or different material. Considering they're not exclusively confined in a specific area like the slime statues, I don't think it's exactly out of place once you bring together the entirety of the Slime Rancher world.

On another note, my guess is that the ancient ruins was a way to contain the quantum slimes. Or perhaps even an attempt to bring them over from their own reality to this one. But I doubt this was how slimes came to being in this world in the first place, considering the game states that the dry reef used to be a seafloor.